Yamaha GX-500 Service Manual Page 29
- Page / 103
- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
Rated. / 5. Based on customer reviews
GX-900
GX-900
“MECHANICAL ADJUSTMENT”
Item to be
Adjusted
Check each
torque
Check FF, REW
take up time
Azimuth
Tape Speed
Wow/Flutter
Tape
CT-160L (FF, REW)
TW-2111A (FWD)
TW-2121A (RVS)
AC-514 (C-60)
MTT-114N
10kHz, –10dB
MTT-111N
3kHz, –10dB
MTT-111N
3kHz, –10dB
Step
1
2
3
4
5
Mode
FF REW
PLAY
FF REW
PLAY
PLAY
PLAY
Rating
FF, REW torque : within 70 ~ 160g/cm.
Take up torque : 30 ~ 70g/cm.
Back tension : 1.5 ~ 6g/cm.
80 to 120 seconds.
Playback output of L and R is maxi-
mum and phase difference should
be minimum both directions. (Fig. B)
3000Hz ± 15Hz
Less than 0.19% (WRMS)
Remarks
After the adjustment
make sure to apply
screw lock paint.
Perform adjustment at
the center of the test
tape, if possible.
Confirm at center of
the test tape, if possi-
ble.
Instrument
required
Torque
meter
ACVM
Oscilloscope
Frequency
counter
Wow/flutter
meter
Adjustment
part
Azimuth
adjustment
screw. (Fig. A)
VR7
OK
Rec out L : ch 1
Rec out R : ch 2
DC input, X-Y (Resurge) mode
NG
Fig. B
0.2V
0.2V
“ELECTRICAL ADJUSTMENT”
● Use 560 mV (250 nwb/m) for 0 dB as the standard level of the unit.
0dB = 250 nwb/m (315 Hz) = – 7 dBV (Rec out level)
Item to be
Adjusted
Playback
level (315Hz)
Confirmation of
playback frequency
response
Step
1
2
Rating
– 7 dBV ± 0.3 dBV
Check that the 10kHz playback
level is within 0 ± 3 dB of the
1kHz playback level. (Fig. C)
Adjustment
parts
VR4 (L ch)
VR1 (R ch)
Tape
MTT-212N
315Hz,
250nwb/m
Test tape for frequency check.
3180µs + 120µs (LH) (MTT-256)
3180µs+70µs (CrO2) (MTT-356)
Points of
measurement
REC OUT
REC OUT
Mode
PLAY
PLAY
Instrument
required
ACVM
ACVM
Oscilloscope
< Playback section >
● PLAYBACK FREQUENCY RESPONSE
± 4dB
± 3.5dB
1k
± 3dB
± 3dB
3k 10kHz31525050 12.5kHz
Fig. C
Fig. A
28
Azimuth
adjustment
screw. (REVERSE)
Azimuth
adjustment
screw. (FORWARD)
- MINI COMPONENT SYSTEM 1
- ■ TO SERVICE PERSONNEL 2
- ■ FRONT PANELS 4
- ■ REAR PANELS 5
- ■ SPECIFICATIONS 6
- ■ INTERNAL VIEW 7
- P.C.B. Main (2) 11
- P.C.B. Input 11
- P.C.B. Main (1) 11
- Friction 12
- Disc Table 13
- P.C.B. MD 15
- Mechanism SW P.C.B 16
- Loading Motor 16
- Sled motor 16
- Turn Table 17
- Spindle Motor 17
- Optical Pickup Head 17
- MD Guide (B) 17
- ■ VOLUME RANGE 18
- ■ SYSTEM CONTROL CHECK 18
- ■ TEST MODE 19
- ■ SYSTEM TEST MODE 19
- ■ RECEIVER TEST MODE 20
- ■ TAPE TEST MODE 21
- ■ CD TEST MODE 22
- ■ CD ERROR MESSAGES 23
- ■ CD STANDARD OPERATION CHART 24
- ● OPEN operation 26
- ● DOWN operation 26
- ■ TAPE ADJUSTMENTS 28
- “MECHANICAL ADJUSTMENT” 29
- “ELECTRICAL ADJUSTMENT” 29
- < Recording section > 30
- MD TEST MODE 31
- 2. AUTO adjustment mode 33
- 8. TEST-PLAY mode 33
- MECHANISM ADJUSTMENT 36
- ■ MD ERROR DISPLAY 39
- Mechanism Error 40
- ■ MD TROUBLESHOOTING 41
- ■ IC DATA 46
- ATRAC Encoder/Decoder 47
- MD System Microprocessor 49
- IC11 : M38199EF [P.C.B. CD] 55
- -COM (CD CPU) 55
- IC8 : M38199EF [P.C.B. INPUT] 58
- -COM (SYSTEM CPU) 58
- PATTERN AREA 60
- ■ BLOCK DIAGRAM 61
- POWER OFF^STANDBY 64
- Note : y ~ o 65
- P.C.B. TUNER 66
- (Lead Type Device) 66
- P.C.B. CD (Lead Type Device) 67
- FROM : INPUT (1) 68
- P. C. B. INPUT ( 2 ) 69
- TO: OPERATION(3) 70
- P.C.B. MAIN(1) 71
- ■ PIN CONNECTION DIAGRAM 72
- ■ SCHEMATIC DIAGRAM (MD MAIN) 73
- ■ SCHEMATIC DIAGRAM (MD) 74
- ■ SCHEMATIC DIAGRAM (CD) 75
- ■ SCHEMATIC DIAGRAM (INPUT) 76
- YMERSION 77
- ■ SCHEMATIC DIAGRAM (MAIN) 78
- ■ SCHEMATIC DIAGRAM (TUNER) 79
- PARTS LIST 80
- P.C.B. CD 81
- P.C.B. CD & MD 82
- P.C.B. INPUT 83
- P.C.B. INPUT & MAIN 85
- P.C.B. MAIN & OPERATION 86
- P.C.B. OPERATION & TUNER 87
- P.C.B. MD MAIN 89
- P.C.B. MD MAIN & OTHER 91
- CHIP RESISTOR 92
- ■ MECHANICAL PARTS 94
- New Parts 95
- GREASE APPLICATION DIAGRAM 99
- (MD Recorder) 99
- ● Grease to be supplied 100
- REMOTE CONTROL TRANSMITTER 101
- 1/4W Type 102
- 1/6W Type 102
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